a babe in the woods
A person who acts like they know everything but are basically a lost puppy.
She’s a babe in the woods. She said she knew how to cook, but now her kitchen looks like a war zone.
He’s a babe in the woods. He said he could fix the internet, but now it’s broken and so is he.
They’re babes in the woods. They tried to be smart and ended up getting arrested.